Rancho San Marcos Airport (ICAO: 74AZ) is a private general aviation airport located near Tombstone, in Cochise County, Arizona, United States. It serves as a small, privately owned airstrip used primarily for personal and recreational flying in the region. The airport operates without scheduled commercial airline service and is not open to the general public without prior permission. It sits in the high desert terrain characteristic of southeastern Arizona, in proximity to the historic frontier town of Tombstone.